Merge pull request #54 in CROS/samples from feature/v4 to develop
* commit 'ff3608c36309fe82a57ecd9afdd385dd810bbc8f':
MessageInput (Android) doesn't work. Need to install Bcl Async package in Android project.
Fix error when navigate to Editor > List View (Android)
Fix Cannot implicitly convert type 'System.nfloat' to 'float' in MessageInput sample (iOS)
Fix MessageInputSample (iOS)
Fix unable to cast System.nint to System.int32 in iOS
Fix layout issue in WinRT